The departments of correction have lots of experience dealing with “special” prisoners—e.g., governors, former members of Congress, etc. if we want, we could compare notes with South Korea, who recently sent an ex-president to the slammer.
I think the likeliest outcome would be a facility with exactly one prisoner—Trump. There likely exists such a place, or they could easily construct one. Trump will never be anywhere near a general prison population. Picture Frankie Pentangeli’s setup in The Godfather II.
And accommodating a SS detail would be trivially easy. It would be the most boring detail of their careers, but I’m sure they could provide a few stools so the agents wouldn’t have to stand all day.